Dansk standard DS/EN Eurocode 7 Geotechnical design Part 2: Ground investigation and testing. 1. udgave

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1 Dansk standard DS/EN udgave Eurocode 7: Geoteknik Del 2: Jordbundsundersøgelser og prøvning Eurocode 7 Geotechnical design Part 2: Ground investigation and testing

2 DS/EN København DS projekt: M ICS: Første del af denne publikations betegnelse er: DS/EN, hvilket betyder, at det er en europæisk standard, der har status som dansk standard. Denne publikations overensstemmelse er: IDT med: EN :2007. DS-publikationen er på engelsk. Denne publikation erstatter: DS/ENV :1999 og DS/ENV :1999. DS-publikationstyper Dansk Standard udgiver forskellige publikationstyper. Typen på denne publikation fremgår af forsiden. Der kan være tale om: Dansk standard standard, der er udarbejdet på nationalt niveau, eller som er baseret på et andet lands nationale standard, eller standard, der er udarbejdet på internationalt og/eller europæisk niveau, og som har fået status som dansk standard DS-information publikation, der er udarbejdet på nationalt niveau, og som ikke har opnået status som standard, eller publikation, der er udarbejdet på internationalt og/eller europæisk niveau, og som ikke har fået status som standard, fx en teknisk rapport, eller europæisk præstandard DS-håndbog samling af standarder, eventuelt suppleret med informativt materiale DS-hæfte publikation med informativt materiale Til disse publikationstyper kan endvidere udgives tillæg og rettelsesblade DS-publikationsform Publikationstyperne udgives i forskellig form som henholdsvis fuldtekstpublikation (publikationen er trykt i sin helhed) godkendelsesblad (publikationen leveres i kopi med et trykt DS-omslag) elektronisk (publikationen leveres på et elektronisk medie) DS-betegnelse Alle DS-publikationers betegnelse begynder med DS efterfulgt af et eller flere præfikser og et nr., fx DS 383, DS/EN 5414 osv. Hvis der efter nr. er angivet et A eller Cor, betyder det, enten at det er et tillæg eller et rettelsesblad til hovedstandarden, eller at det er indført i hovedstandarden. DS-betegnelse angives på forsiden. Overensstemmelse med anden publikation: Overensstemmelse kan enten være IDT, EQV, NEQ eller MOD IDT: Når publikationen er identisk med en given publikation. EQV: Når publikationen teknisk er i overensstemmelse med en given publikation, men præsentationen er ændret. NEQ: Når publikationen teknisk eller præsentationsmæssigt ikke er i overensstemmelse med en given standard, men udarbejdet på baggrund af denne. MOD: Når publikationen er modificeret i forhold til en given publikation.

3 EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN March 2007 ICS ; Supersedes ENV :1999, ENV :1999 English Version Eurocode 7 - Geotechnical design - Part 2: Ground investigation and testing Eurocode 7 - Calcul géotechnique - Partie 2: Reconnaissance des terrains et essais This European Standard was approved by CEN on 12 June Eurocode 7 - Entwurf, Berechnung und Bemessung in der Geotechnik - Teil 2: Erkundung und Untersuchung des Baugrunds CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2007 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN :2007: E

4 Contents... Page Foreword... 7 Section 1 General Scope Scope of Eurocode Scope of EN Normative references Assumptions Distinction between Principles and Application Rules Definitions Terms common to all Eurocodes Terms common to Eurocode Specific definitions used in EN Test results and derived values The link between EN and EN Section 2 Planning of ground investigations Objectives General Ground Construction materials Groundwater Sequence of ground investigations Preliminary investigations Design investigations Field investigations Laboratory tests Controlling and monitoring Section 3 Soil and rock sampling and groundwater measurements General Sampling by drilling Sampling by excavation Soil sampling Categories of sampling methods and laboratory quality classes of samples Soil identification Planning of soil sampling Handling, transport and storing of samples Rock sampling Categories of sampling methods Rock identification Planning of rock sampling Handling, transport and storing of samples Groundwater measurements in soils and rocks General Planning and execution of the measurements Evaluation of results of groundwater measurements

5 Section 4 Field tests in soil and rock General General requirements Planning a specific test programme Execution Evaluation Cone penetration and piezocone penetration tests (CPT, CPTU) Objectives Specific requirements Evaluation of test results Use of test results and derived values Pressuremeter tests (PMT) Objectives Specific requirements Evaluation of test results Use of test results and derived values Flexible dilatometer test (FDT) Objectives Specific requirements Evaluation of test results Use of test results and derived values Standard penetration test (SPT) Objectives Specific requirements Evaluation of test results Use of test results and derived values Dynamic probing tests (DP) Objectives Specific requirements Evaluation of test results Use of test results and derived values Weight sounding test (WST) Objectives Specific requirements Evaluation of test results Use of test results and derived values Field vane test (FVT) Objectives Specific requirements Evaluation of test results Use of test results and derived values Flat dilatometer test (DMT) Objectives Specific requirements Evaluation of test results Use of test results and derived values Plate loading test (PLT) Objectives Specific requirements Evaluation of test results Use of test results and derived values

6 Section 5 Laboratory tests on soil and rock General General requirements for laboratory tests General requirements Procedures, equipment and presentation Evaluation of test results Preparation of soil specimens for testing Objective Requirements Preparation of rock specimens for testing Objective Requirements Tests for classification, identification and description of soil General Requirements for all classification tests Water content determination Bulk density determination Particle density determination Particle size analysis Consistency limits determination Determination of the density index of granular soil Soil dispersibility determination Frost susceptibility Chemical testing of soil and groundwater Requirements for all chemical tests Organic content determination Carbonate content determination Sulfate content determination ph value determination (acidity and alkalinity) Chloride content determination Strength index testing of soil Objective Requirements Use of test results Strength testing of soil Objective and scope General requirements Evaluation and use of test results Unconfined compression test Unconsolidated, undrained triaxial compression test Consolidated triaxial compression test Consolidated direct shear box tests Compressibility and deformation testing of soil General Oedometer compressibility testing Triaxial deformability testing Compaction testing of soil Scope Compaction tests California Bearing ratio (CBR) test

7 5.11 Permeability testing of soil Objective Requirements Evaluation and use of test results Tests for classification of rocks General Requirements for all classification tests Rock identification and description Water content determination Density and porosity determination Swelling testing of rock material General General requirements Evaluation of test results Swelling pressure index under zero volume change Swelling strain index for radially-confined specimens with axial surcharge Swelling strain developed in unconfined rock specimen Strength testing of rock material General Requirements for all strength tests Evaluation of test results Uniaxial compression and deformability test Point load test Direct shear test Brazil test Triaxial compression test Section 6 Ground investigation report General requirements Presentation of geotechnical information Evaluation of geotechnical information Establishment of derived values Annex A (informative) List of test results of geotechnical test standards Annex B (informative) Planning of geotechnical investigations Annex C (informative) Example of groundwater pressure derivations based on a model and long term measurements Annex D (informative) Cone and piezocone penetration tests Annex E (informative) Pressure meter test Annex F (informative) Standard penetration test Annex G (informative) Dynamic probing test Annex H (informative) Weight sounding test 134 Annex I (informative) Field vane test Annex J (informative) Flat dilatometer test Example of correlations between E OED and DMT results Annex K (informative) Plate loading test Annex L (informative) Detailed information on preparation of soil specimens for testing Annex M (informative) Detailed information on tests for classification, identification and description of soil Annex N (informative) Detailed information on chemical testing of soil

8 Annex O (informative) Detailed information on strength index testing of soil Annex P (informative) Detailed information on strength testing of soil Annex Q (informative) Detailed information on compressibility testing of soil Annex R (informative) Detailed information on compaction testing of soil Annex S (informative) Detailed information on permeability testing of soil Annex T (informative) Preparation of specimen for testing on rockmaterial Annex U (informative) Classification testing of rock material Annex V (informative) Swelling testing of rock material Annex W (informative) Strength testing of rock material Annex X (informative) Bibliography

9 Foreword This document (EN : 2007) has been prepared by Technical Committee CEN/TC 250 "Structural Eurocodes", the secretariat of which is held by BSI. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by September 2007, and conflicting national standards shall be withdrawn at the latest by March This document supersedes ENV :1999 and ENV :1999. CEN/TC 250 is responsible for all Structural Eurocodes. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Portugal, Poland, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Background of the Eurocode programme In 1975, the Commission of the European Community decided on an action programme in the field of construction, based on article 95 of the Treaty. The objective of the programme was the elimination of technical obstacles to trade and the harmonization of technical specifications. Within this action programme, the Commission took the initiative to establish a set of harmonised technical rules for the design of construction works, which, in a first stage, would serve as an alternative to the national rules in force in the Member States and, ultimately, would replace them. For fifteen years, the Commission, with the help of a Steering Committee with representatives of Member States, conducted the development of the Eurocodes programme, which led to the first generation of European codes in the 1980s. In 1989, the Commission and the Member States of the EU and EFTA decided, on the basis of an agreement 1 between the Commission and CEN, to transfer the preparation and the publication of the Eurocodes to CEN through a series of Mandates, in order to provide them with a future status of European Standard (EN). This links de facto the Eurocodes with the provisions of all the Council s Directives and/or Commission s Decisions dealing with European standards (e.g. the Council Directive 89/106/EEC on construction products - CPD - and Council Directives 93/37/EEC, 92/50/EEC and 89/440/EEC on public works and services and equivalent EFTA Directives initiated in pursuit of setting up the internal market). The Structural Eurocode programme comprises the following standards generally consisting of a number of Parts: EN 1990 Eurocode : Basis of Structural Design EN 1991 Eurocode 1: Actions on structures 1 Agreement between the Commission of the European Communities and the European Committee for Standardization (CEN) concerning the work on EUROCODES for the design of building and civil engineering works (BC/CEN/03/89). 7

10 EN 1992 Eurocode 2: Design of concrete structures EN 1993 Eurocode 3: Design of steel structures EN 1994 Eurocode 4: Design of composite steel and concrete structures EN 1995 Eurocode 5: Design of timber structures EN 1996 Eurocode 6: Design of masonry structures EN 1997 Eurocode 7: Geotechnical design EN 1998 Eurocode 8: Design of structures for earthquake resistance EN 1999 Eurocode 9: Design of aluminium structures Eurocode standards recognise the responsibility of regulatory authorities in each Member State and have safeguarded their right to determine values related to regulatory safety matters at national level where these continue to vary from State to State. Status and field of application of Eurocodes The Member States of the EU and EFTA recognise that Eurocodes serve as reference documents for the following purposes: as a means to prove compliance of building and civil engineering works with the essential requirements of Council Directive 89/106/EEC, particularly Essential Requirement N 1 Mechanical resistance and stability and Essential Requirement N 2 Safety in case of fire; as a basis for specifying contracts for construction works and related engineering services; as a framework for drawing up harmonised technical specifications for construction products (ENs and ETAs). The Eurocodes, as far as they concern the construction works themselves, have a direct relationship with the Interpretative Documents 2 referred to in Article 12 of the CPD, although they are of a different nature from harmonised product standards 3. Therefore, technical aspects arising from the Eurocodes work need to be adequately considered by CEN Technical Committees and/or EOTA Working Groups working on product standards with a view to achieving full compatibility of these technical specifications with the Eurocodes. The Eurocode standards provide common structural design rules for everyday use for the design of whole structures and component products of both a traditional and an innovative nature. Unusual forms of construction or design conditions are not specifically covered and additional expert consideration will be required by the designer in such cases. 2 According to Art. 3.3 of the CPD, the essential requirements (ERs) shall be given concrete form in interpretative documents for the creation of the necessary links between the essential requirements and the mandates for harmonised ENs and ETAGs/ETAs. 3 According to Art. 12 of the CPD the interpretative documents shall : a) give concrete form to the essential requirements by harmonising the terminology and the technical bases and indicating classes or levels for each requirement where necessary ; b) indicate methods of correlating these classes or levels of requirement with the technical specifications, e.g. methods of calculation and of proof, technical rules for project design, etc. ; c) serve as a reference for the establishment of harmonised standards and guidelines for European technical approvals. The Eurocodes, de facto, play a similar role in the field of the ER 1 and a part of ER 2. 8

11 National Standards implementing Eurocodes The National Standards implementing Eurocodes will comprise the full text of the Eurocode (including any annexes), as published by CEN, which may be preceded by a National title page and National foreword, and may be followed by a National annex. The National annex may only contain information on those parameters, which are left open in the Eurocode for national choice, known as Nationally Determined Parameters, to be used for the design of buildings and civil engineering works to be constructed in the country concerned, i.e.: values and/or classes where alternatives are given in the Eurocode; values to be used where a symbol only is given in the Eurocode; country specific data (geographical, climatic), e.g. snow map; the procedure to be used where alternative procedures are given in the Eurocode. It may also contain: decisions on the application of informative annexes; references to non-contradictory complementary information to assist the user to apply the Eurocode. Links between Eurocodes and harmonised technical specifications (ENs and ETAs) for products There is a need for consistency between the harmonised technical specifications for construction products and the technical rules for works 4. Furthermore, all the information accompanying the CE Marking of the construction products, which refer to Eurocodes, should clearly mention which Nationally Determined Parameters have been taken into account. Additional information specific to Eurocode 7 EN gives guidance for the planning and interpretation of geotechnical laboratory and field tests that are used for the support of geotechnical design of buildings and civil engineering works. EN is intended for clients, designers, geotechnical laboratories, field testing laboratories and public authorities. EN is intended to be used with EN When using EN , particular regard should be paid to the underlying assumptions and conditions given in 1.3. The six sections of EN are complemented by 24 informative annexes. National annex for EN The national standard implementing EN should have a national annex containing all information concerning the application of EN in the relevant country. 4 See Art.3.3 and Art.12 of the CPD, as well as 4.2, 4.3.1, and 5.2 of ID 1. 9

12 Section 1 General 1.1 Scope Scope of Eurocode 7 (1) EN 1997 is intended to be used in conjunction with EN 1990:2002, which establishes the principles and requirements for safety and serviceability, describes the basis of design and verification and gives guidelines for related aspects of structural reliability. (2) EN 1997 is intended to be applied to the geotechnical aspects of the design of buildings and civil engineering works. It is subdivided into various separate parts (see 1.1.2). (3) EN 1997 is concerned with the requirements for strength, stability, serviceability and durability of structures. Other requirements, e.g. concerning thermal or sound insulation, are not considered. (4) Numerical values of actions on buildings and civil engineering works to be taken into account in design are provided in EN 1991 for the various types of construction. Actions imposed by the ground, such as earth pressures, shall be calculated according to the rules of EN (5) Separate European Standards are intended to be used to treat matters of execution and workmanship. They are denoted in the relevant sections. (6) In EN 1997 execution is covered to the extent that is necessary to conform to the assumptions of the design rules. (7) EN 1997 does not cover the special requirements of seismic design. EN 1998 provides additional rules for geotechnical seismic design, which complete or adapt the rules of this standard Scope of EN (1) EN is intended to be used in conjunction with EN and provides rules supplementary to EN related to: planning and reporting of ground investigations; general requirements for a number of commonly used laboratory and field tests; interpretation and evaluation of test results; derivation of values of geotechnical parameters and coefficients. In addition, examples of the application of field test results to design are given. NOTE Establishment of characteristic values is covered in EN (2) This document gives no specific provisions for environmental ground investigations. (3) Only commonly used geotechnical laboratory and field tests are covered in this standard. These were selected on the basis of their importance in geotechnical practice, availability in 10

13 commercial geotechnical laboratories and existence of an accepted testing procedure in Europe. The laboratory tests on soils are mainly applicable to saturated soils. NOTE It is expected that updates of the present standard will gradually include laboratory and field tests covering additional aspects of soil and rock behaviour. (4) The provisions of this standard apply primarily to projects of geotechnical category 2, as defined in 2.1 of EN :2004. The ground investigation requirements for category 1 projects are normally limited as the verifications often will be based on local experience. For geotechnical category 3 projects, the amount of investigations required will normally be at least the same as indicated for geotechnical category 2 projects in the following sections. Additional investigations and more advanced tests, related to the circumstances that place a project in geotechnical category 3, may be necessary. (5) The derivation of parameter values is dedicated primarily to the design of pile and spread foundations based on field testing, as detailed in Annexes D, E, F and G of EN : Normative references (1) The following normative documents contain provisions which, through reference in this text, constitute provisions of this European Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this European Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the last edition of the normative document referred to applies. EN 1990:2002 Eurocode Basis of structural design EN :2004 Eurocode 7 Geotechnical design Part 1: General rules EN ISO Geotechnical investigation and testing Identification and classification of soil Part 1: Identification and description EN ISO Geotechnical investigation and testing Identification and classification of soil Part 2: Classification principles EN ISO Geotechnical investigation and testing Identification and classification of rock - Part 1: Identification and description EN ISO Geotechnical investigation and testing Sampling by drilling and excavation and groundwater measurements Part 1: Technical principles of execution EN ISO Geotechnical investigation and testing Field testing Part 1: Electrical CPT and CPTU EN ISO Geotechnical investigation and testing Field testing Part 2: Dynamic probing EN ISO Geotechnical investigation and testing Field testing Part 3: Standard penetration test EN ISO Geotechnical investigation and testing Field testing Part 4: Ménard pressuremeter test EN ISO Geotechnical investigation and testing Field testing Part 5: Flexible dilatometer test EN ISO Geotechnical investigation and testing Field testing Part 6: Self boring pressuremeter test 5 to be published 11